Throttle position sensor input above the maximum acceptable voltage. Follow all appropriate diagnostics for the fault that is present. Prior to replacing parts, check all connectors between the speed control switch and the PCM for moisture Internally the PCM uses the same A/D (analog to digital) converter for TPS voltage as it does for the speed control switch sense. If the v-37 circuit has voltage bleed over from another source, a code of TPS Shorted to voltage may be set in the PCM. The DN model equipped with rear heat option, has an external water pump to circulate coolant to the rear heater. If you find coolant in the bulkhead connector, the likely cause would be a leaking coolant pump. Pump should be replaced if found leaking. If the code sets when the A/C is turned on go right to the bulk head connector and check for moisture. Check for a shorted clock spring causing the speed control 5 volt feed to be shorted to power.

A lean air/fuel mixture has been indicated by an abnormally rich correction factor.

P0172 (M)

System too Rich (Bank 1)

A rich air/fuel mixture has been indicated by an abnormally lean correction factor. Was the fuel pressure checked with a DRBIII pressure transducer? Is the fuel pressure within specification with engine running at normal operating temperature? Verify the correct DRBIII PEP module pressure transducer is being used It is critical when reading pressures with the DRBIII PEP module pressure transducers that the proper transducer is being used. A too high of value transducer will cause inaccurate readings. It is also critical that the DRBIII and pressure transducer is zeroed out before taking a reading.Repair or replace any fuel system malfunctioning components.

P0173 (M)

Fuel Trim Malfunction (Bank 2)

P0174 (M)

System too Lean (Bank 2)

A lean air/fuel mixture has been indicated by an abnormally rich correction factor.

P0175 (M)

System too Rich (Bank 2)

A rich air/fuel mixture has been indicated by an abnormally lean correction factor.

A rationality error has been detected for loss of crankshaft position sensor.

P0336 (M)

Crankshaft Position (CKP) Sensor Signal

Problem with voltage signal from CKP.

P0339

Crankshaft Position Sensor Circuit Intermittent

A rationality error has been detected for intermittent loss of crankshaft position sensor.

P0340 (M)

Camshaft Position Sensor A Circuit (Bank 1 or Single Sensor)

A rationality error has been detected for loss of camshaft position sensor (no fuel sync). WJ 1999 &' 2000: Check the camshaft target wheel (located on the right side camshaft sprocket) for damage or excessive runout. The runout is very critical for proper camshaft signal input to the JTEC. The lateral runout on the target wheel should not exceed 0.012 inch.

P0341 (M)

Camshaft Position Sensor A Circuit Range/Performance (Bank 1 or Single Sensor)

P0342 (M)

Camshaft Position Sensor A Circuit Low Input (Bank 1 or Single Sensor)

P0343 (M)

Camshaft Position Sensor A Circuit High Input (Bank 1 or Single Sensor)

P0344

Camshaft Position Sensor A Circuit Intermittent (Bank 1 or Single Sensor)

A rationality error has been detected for intermittent loss of camshaft position sensor.

P0345

Camshaft Position Sensor A Circuit (Bank 2)

P0346

Camshaft Position Sensor A Circuit Range/Performance (Bank 2)

P0347

Camshaft Position Sensor A Circuit Low Input (Bank 2)

P0348

Camshaft Position Sensor A Circuit High Input (Bank 2)

P0349

Camshaft Position Sensor A Circuit Intermittent (Bank 2)

P0350

Ignition Coil Primary/Secondary Circuit

A coil (1-5) is drawing too much current.

P0351 (M)

Ignition Coil A Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time.

P0352 (M)

Ignition Coil B Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time.

P0353 (M)

Ignition Coil C Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time.

P0354 (M)

Ignition Coil D Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (High Impedance).

P0355 (M)

Ignition Coil E Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (High Impedance).

P0356 (M)

Ignition Coil F Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0357 (M)

Ignition Coil G Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0358 (M)

Ignition Coil H Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0359

Ignition Coil I Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0360

Ignition Coil J Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0361

Ignition Coil K Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0362

Ignition Coil L Primary/Secondary Circuit

Peak primary circuit current not achieved with maximum dwell time (high impedance).

P0365

Camshaft Position Sensor B Circuit (Bank 1)

P0366

Camshaft Position Sensor B Circuit Range/Performance (Bank 1)

P0367

Camshaft Position Sensor B Circuit Low Input (Bank 1)

P0368

Camshaft Position Sensor B Circuit High Input (Bank 1)

P0369

Camshaft Position Sensor B Circuit Intermittent (Bank 1)

P0370

Timing Reference High Resolution Signal A)

P0371

Timing Reference High Resolution Signal A Too Many Pulses

P0372

Timing Reference High Resolution Signal A Too Few Pulses

P0373

Timing Reference High Resolution Signal A Intermittent/Erratic Pulses

P0374

Timing Reference High Resolution Signal A No Pulse

P0375

Timing Reference High Resolution Signal B

P0376

Timing Reference High Resolution Signal B Too Many Pulses

P0377

Timing Reference High Resolution Signal B Too Few Pulses

P0378

Timing Reference High Resolution Signal B Intermittent/Erratic Pulses

P0379

Timing Reference High Resolution Signal B No Pulses

P0380 (M)

Glow Plug/Heater Circuit A

P0381 (M)

Glow Plug/Heater Indicator Circuit

P0382 (M)

Glow Plug/Heater Circuit B

P0385

Crankshaft Position Sensor B Circuit

P0386

Crankshaft Position Sensor B Circuit Range/Performance

P0387

Crankshaft Position Sensor B Circuit Low Input

P0388

Crankshaft Position Sensor B Circuit High Input

P0389

Crankshaft Position Sensor B Circuit Intermittent

P0390

Camshaft Position Sensor B Circuit (Bank 2)

P0391

Camshaft Position Sensor B Circuit Range/Performance (Bank 2)

P0392

Camshaft Position Sensor B Circuit Low Input (Bank 2)

P0393

Camshaft Position Sensor B Circuit High Input (Bank 2)

P0394

Camshaft Position Sensor B Circuit Intermittent (Bank 2)

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P0400

Diesel EGR System Failure

Diesel EGR control module not active or a fault condition of the dedicated EGR sensors and/or EGR solenoid was detected by the EGR control

P0401 (M)

EGR System Failure

Required change in air/fuel ration not detected during diagnostic test.

P0402 (M)

Exhaust Gas Recirculation Flow Excessive Detected

P0403 (M)

EGR Solenoid Circuit

An open or shorted condition detected in the EGR solenoid control circuit.

P0404 (M)

Exhaust Gas Recirculation Control Circuit Range/Performance

EGR position sensor signal does not correlate to EGR duty cycle.

P0405 (M)

Exhaust Gas Recirculation Sensor A Circuit Low

EGR position sensor input below the acceptable voltage range.

P0406 (M)

Exhaust Gas Recirculation Sensor A Circuit High

EGR position sensor input above the acceptable voltage range.

P0407

Exhaust Gas Recirculation Sensor B Circuit Low

P0408

Exhaust Gas Recirculation Sensor B Circuit High

P0409

Exhaust Gas Recirculation Sensor A Circuit

P0410

Secondary Air Injection System

P0411

Secondary Air Injection System Incorrect Flow Detected

P0412

Secondary Air Injection System Switching Valve A Circuit

An open or shorted condition detected in the secondary air (air switching/aspirator) solenoid control circuit.

P0413

Secondary Air Injection System Switching Valve A Circuit Open

P0414

Secondary Air Injection System Switching Valve A Circuit Shorted

P0415

Secondary Air Injection System Switching Valve B Circuit

P0416

Secondary Air Injection System Switching Valve B Circuit Open

P0417

Secondary Air Injection System Switching Valve B Circuit Shorted

P0418

Secondary Air Injection System Relay A Circuit

P0419

Secondary Air Injection System Relay B Circuit

P0420 (M)

Catalyst System Efficiency Below Threshold (Bank 1)

Catalyst 1/1 efficiency below required level.

P0421

Warm Up Catalyst Efficiency Below Threshold (Bank 1)

P0422

Main Catalyst Efficiency Below Threshold (Bank 1)

P0423

Heated Catalyst Efficiency Below Threshold (Bank 1)

P0424

Heated Catalyst Efficiency Below Threshold (Bank 1)

P0425

Catalyst Temperature Sensor (Bank 1)

P0426

Catalyst Temperature Sensor Range/Performance (Bank 1)

P0427

Catalyst Temperature Sensor Low Input (Bank 1)

P0428

Catalyst Temperature Sensor High Input (Bank 1)

P0429

Catalyst Heater Control Circuit (Bank 1)

P0430

Catalyst System Efficiency Below Threshold (Bank 2)

P0431

Warm Up Catalyst Efficiency Below Threshold (Bank 2)

P0432 (M)

Main Catalyst Efficiency Below Threshold (Bank 2)

Catalyst 2/1 efficiency below required level.

P0433

Heated Catalyst Efficiency Below Threshold (Bank 2)

P0434

Heated Catalyst Temperature Below Threshold (Bank 2)

P0435

Catalyst Temperature Sensor (Bank 2)

P0436

Catalyst Temperature Sensor Range/Performance (Bank 2)

P0436

Catalyst Temperature Sensor Low Input (Bank 2)

P0438

Catalyst Temperature Sensor High Input (Bank 2)

P0439

Catalyst Heater Control Circuit (Bank 2)

P0439

Evaporative Emission Control System

P0441 (M)

Evaporative Emission Control System Incorrect Purge Flow

Insufficient or excessive vapor flow detected during evaporative emission system operation. If after performing all powertrain test for P0441 with results that appear to be normal/test pass, check for fuel in the purge canister. If there is fuel in the purge canister check ORVR (on-board refueling vapor recovery) system per service manual section 25. If ORVO is working as designed insure that the vehicle owner is not overfilling the fuel tank.

An open or shorted condition detected in the EVAP purge solenoid control circuit. Check the charcoal canister for fuel saturation If the vehicle has been overfueled, then there is a chance that liquid fuel can enter the canister and cause drive problems or emission related problems.

P0444

Evaporative Emission Control System Purge Control Valve Circuit Open

P0445

Evaporative Emission Control System Purge Control Valve Circuit Shorted

P0446

Evaporative Emission Control System Vent Control Circuit

P0447

Evaporative Emission Control System Vent Control Circuit Open

P0448

Evaporative Emission Control System Vent Control Circuit Shorted

P0449

Evaporative Emission Control System Vent Valve/Solenoid Circuit

P0450

Evaporative Emission Control System Pressure Sensor

P0451

Evaporative Emission Control System Pressure Sensor Range/Performance

P0452

Evaporative Emission Control System Pressure Sensor Low Input

NVLD pressure switch stuck closed.

P0453

Evaporative Emission Control System Pressure Sensor High Input

NVLD pressure switch stuck open.

P0454

Evaporative Emission Control System Pressure Sensor Intermittent

P0455 (M)

Evaporative Emission Control System Leak Detected (large leak)

A large leak has been detected in the evaporative system. See TSB 25-001-02. Also, possible faulty or loose gas cap. Note: The respective Powertrain Diagnostic Procedures Manual will direct the technician to determine if the vehicle evaporative system has an external system leak. Examples of some external system leaks are: a loose gas cap, a disconnected evaporative system hose, or a loose hose connection. Remember that the evaporative system may also have an internal system leak. This internal leak may be caused by an intermittent or permanently stuck open Duty Cycle Purge (DCP) valve. This leak source is considered to be internal because any escaping emissions enter into the engine system and not directly into the atmosphere, unlike an external leak. An internal leak may cause one of the above DTC?s. Possible causes of a stuck open (intermittent or permanent) DCP valve are: 1. Corrosion due to system moisture or possible water intrusion into the system.

P0456 (M)

Evaporative Emission Control System Leak Detected (very small leak)

A 0.020 leak has been detected in the evaporative system. See TSB's 25-001-02A,

(Also see Notes in P0455 above). Does customer regularly commute on a steep grade (down hill grades in excess of 10%? Has the Leak Detection Pump Operation and Diagnosis booklet (Publication No. 81-170-000606) been used to assist in the diagnosis?

Review and if necessary, perform TSB 18-010-02. Be sure to completely read the TSB. The fix for the condition is a PCM replacement, not a reprogramming of the controller. Be sure that there is not any leaks in the system. This TSB applies in a very limited number of cases and usually in mountainous regions. TSB 18-010-02 Is a PCM replacement correct an erroneous MIL illumination for SAE P0456 that sets when driven on steep grades.

An open or shorted condition detected in the manifold tuning valve solenoid control circuit.

P0661

Intake Manifold Tuning Valve Control Circuit Low (Bank 1)

P0662

Intake Manifold Tuning Valve Control Circuit High (Bank 1)

P0663

Intake Manifold Tuning Valve Control Circuit (Bank 2)

P0664

Intake Manifold Tuning Valve Control Circuit Low (Bank 2)

P0665

Intake Manifold Tuning Valve Control Circuit High (Bank 2)

P0685

ASD Relay Control Circuit

An open or shorted condition detected in the ASD relay control circuit.

P0688

ASD Relay Sensor Circuit Low

ASD voltage sensed when ASD relay is energized or ASD voltage not sensed when ASD relay is not energized.

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P0700 (M)

Check Transmission DTC's

This code indicates that the EATX (Transmission controller) has an active fault and has illuminated the MIL via a BUS message. The specific fault must be acquired from the EATX via a DRBIII tool. (Input or Output Speed Sensor failures often cause this code and are a common failure part on WJ Grand Cherokees).

P0701

Transmission Control System Range/Performance

P0702

Transmission Control System Electrical

P0703 (M)

Brake Switch Stuck Pressed or Released

Incorrect input state detected in the brake switch circuit. (Changed from P1595).

P0704

Clutch Switch Input Circuit Malfunction

P0705

Transmission Range Sensor Circuit Malfunction (PRNDL Input)

P0706

Transmission Range Sensor Circuit Range/Performance

P0707

Transmission Range Sensor Circuit Low Input

P0708

Transmission Range Sensor Circuit High Input

P0709

Transmission Range Sensor Circuit Intermittent

P0710

Transmission Fluid Temperature Sensor Circuit

P0711 (M)

Transmission Temperature Sensor No Temperature Rise After Start

Relationship between the transmission temperature and overdrive operation and or TCC operation indicates a failure of the Transmission Temperature Sensor - OBDII Rationality.

An open or shorted condition detected in the torque converter part throttle unlock solenoid control circuit (3 or 4-speed auto. trans. only).

P0744

Torque Converter Clutch Circuit Intermittent

P0745

Pressure Control Solenoid A

P0746

Pressure Control Solenoid A Performance or Stuck Off

P0747

Pressure Control Solenoid A Stuck On

P0748 (M)

Governor Pressure Solenoid Control/Transmission Relay Circuits

An open or shorted condition detected in the Governor Pressure Solenoid circuit or Transmission Relay Circuit in JTEC RE transmissions.

P0748 (M)

Governor Pressure Solenoid Control/Transmission Relay Circuits

An open or shorted condition detected in the governor pressure solenoid or relay circuits (4-speed auto. trans. only).

P0749

Pressure Control Solenoid A Intermittent

P0750

Shift Solenoid circuit.

Note: If code P1767 (Transmission Relay Always On) is also present: Replace transmission solenoid assembly. See note provided. When transmission is in limp mode the relay that provides power to the solenoid group is switched off. This is normal and is designed to provide operation in one gear only.

An open or shorted condition detected in either of the speed control vacuum or vent solenoid control circuits.

P1596

Speed Control Switch Always High

Speed control switch input above maximum acceptable voltage. Check the bottom row of pins in the C200 connector for contamination If the bulkhead (C200 connector in some applications as DN model) is contaminated by moisture, the speed control may not set. This may occur after driving the vehicle in rain or by washing the vehicle. Also if the rear heater water pump is leaking, as on a DN model with rear heat, the C200 could be contaminated with anti-freeze. Once connector is cleaned from antifreeze contamination, review water pump for potential leak and repair as necessary. If there is water intrusion into the connector, dry the connector and repair area that is allowing water into the connector. This area is the source of many speed control complaints. Various fault codes can be set due to contamination of this connector.

An open or shorted condition detected in the speed control servo power control circuit (SBECII: external relay).

P1684

Battery Loss In The Last 50 Starts

The battery has been disconnected within the last 50 starts. starts (status indicator only - NOT a reported fault code)

P1685

Skim Invalid Key

The engine controller has received an invalid key from the SKIM.

P1686

No SKIM BUS Messages Received

No CCD/J1850 messages received from the Smart Key Immobilizer Module (SKIM).

P1687

No MIC BUS Message

No CCD/J1850 messages received from the Mechanical Instrument Cluster (MIC) Module.

P1688 (M)

Internal Fuel Injection Pump Controller Failure

P1689 (M)

No Communication Between ECM and Injection Pump Module

P1690 (M)

Fuel Injection Pump CKP Sensor Does Not Agree with ECM CKP Sensor

P1691

Fuel Injection Pump Controller Calibration Error

P1692

DTC Set in ECM

P1693 (M)

DTC Detected in Companion Module

A fault has been generated in the companion engine control module.

P1693 (M)

DTC Detected in PCM/ECM or DTC Detected in ECM

A “Companion DTC” was set in both the ECM and PCM.

P1694

Fault In Companion Module

No CCD/J1850 messages received from the powertrain control module-Asian transmission.

P1694 (M)

No BUS CCD Messages Received from ECM

Bus communication failure to PCM.

P1695

No CCD/J1850 Message From Body Control Module

No CCD/J1850 messages received from the body control module.

P1696 (M)

PCM Failure EEPROM Write Denied

Unsuccessful attempt to write to an EEPROM location by the control module.

P1697 (M)

PCM Failure SRI Mile Not Stored

Unsuccessful attempt to update Service Reminder Indicator (SRI or EMR) mileage in the control module EEPROM.

P1698 (M)

No CCD/J1850 Message From TCM

No CCD/J1850 messages received from the electronic transmission control module (EATX) or the Asian transmission controller.

P1698 (M)

No CCD/J1850 Message From PCM

Bus communication failure to PCM. A “Companion DTC” was set in both the ECM and PCM. May be caused by after market remote starter. Remove after market remote starter. This code can be set as the remote starter is activated and the pcm receives ignition run voltage and the tcm does not.

An open or shorted condition detected in the speed control servo power control circuit (SBECII: external relay).

P1684

Battery Loss In The Last 50 Starts

The battery has been disconnected within the last 50 starts. starts (status indicator only - NOT a reported fault code)

P1685

Skim Invalid Key

The engine controller has received an invalid key from the SKIM.

P1686

No SKIM BUS Messages Received

No CCD/J1850 messages received from the Smart Key Immobilizer Module (SKIM).

P1687

No MIC BUS Message

No CCD/J1850 messages received from the Mechanical Instrument Cluster (MIC) Module.

P1688 (M)

Internal Fuel Injection Pump Controller Failure

P1689 (M)

No Communication Between ECM and Injection Pump Module

P1690 (M)

Fuel Injection Pump CKP Sensor Does Not Agree with ECM CKP Sensor

P1691

Fuel Injection Pump Controller Calibration Error

P1692

DTC Set in ECM

P1693 (M)

DTC Detected in Companion Module

A fault has been generated in the companion engine control module.

P1693 (M)

DTC Detected in PCM/ECM or DTC Detected in ECM

A “Companion DTC” was set in both the ECM and PCM.

P1694

Fault In Companion Module

No CCD/J1850 messages received from the powertrain control module-Asian transmission.

P1694 (M)

No BUS CCD Messages Received from ECM

Bus communication failure to PCM.

P1695

No CCD/J1850 Message From Body Control Module

No CCD/J1850 messages received from the body control module.

P1696 (M)

PCM Failure EEPROM Write Denied

Unsuccessful attempt to write to an EEPROM location by the control module.

P1697 (M)

PCM Failure SRI Mile Not Stored

Unsuccessful attempt to update Service Reminder Indicator (SRI or EMR) mileage in the control module EEPROM.

P1698 (M)

No CCD/J1850 Message From TCM

No CCD/J1850 messages received from the electronic transmission control module (EATX) or the Asian transmission controller.

P1698 (M)

No CCD/J1850 Message From PCM

Bus communication failure to PCM. A “Companion DTC” was set in both the ECM and PCM. May be caused by after market remote starter. Remove after market remote starter. This code can be set as the remote starter is activated and the pcm receives ignition run voltage and the tcm does not.

P1699

No Climate Bus Messages

No CCD/J1850 messages received from the Climate Control Module (CCM)

Scan Code

DRB Scan Tool Display

Description of Diagnostic Trouble Code

P1719

Skip Shift Solenoid Circuit

An open or shorted condition detected in the transmission 2-3 gear lock-out solenoid control circuit.

P1740 (M)

TCC or O/D Solenoid Performance

Rationality error detected in either the torque convertor clutch or solenoid or overdrive solenoid system.

The requested pressure and the actual pressure are not within a tolerance band for the Governor Control System which is used to regulate governor pressure to control shifts for 1st 2nd and 3rd gear (Mid Pressure Malfunction).

The requested pressure and the actual pressure are not within a tolerance band for the Governor Control System which is used to regulate governor pressure to control shifts for 1st 2nd and 3rd gear (Zero Pressure Malfunction).